The antagonist of A Wrinkle in Time
is the Black Thing
(otherwise called the Darkness or the shadow or, in its incarnation on Camazotz, IT
). The Black Thing represents Evil at work in the universe: it has taken over Camazotz entirely, which is referred to as a dark planet, and Earth is currently half taken over and looks like it is covered in a "smoky haze" from afar. Tessering through the Black Thing is also extremely painful. Through the Black Thing the novel shows how evil is hard to pin down or describe (the Black Thing is rather a vague description, after all), but one knows it when one sees it, as when the children see it partly blanketing their own world.